feat: add signed PostgreSQL release updates

oa-backend/src/main/java/com/kaidi/oa/domain/TechContract.java

@@ -7,7 +7,7 @@ import jakarta.persistence.Entity;
 import jakarta.persistence.GeneratedValue;
 import jakarta.persistence.GenerationType;
 import jakarta.persistence.Id;
-import jakarta.persistence.Lob;
+import jakarta.persistence.Column;
 import jakarta.persistence.Table;
 
 /**
@@ -58,11 +58,11 @@ public class TechContract {
     private String ipAssetName;
 
     /** 自动生成的创新技术方案（材料）。 */
-    @Lob
+    @Column(columnDefinition = "TEXT")
     private String techScheme;
 
     /** 自动生成的承诺书（材料）。 */
-    @Lob
+    @Column(columnDefinition = "TEXT")
     private String commitmentLetter;
 
     private String owner;